81459758899 has 16 divisors (see below), whose sum is σ = 84297604608. Its totient is φ = 78671859552.

The previous prime is 81459758879. The next prime is 81459758903. The reversal of 81459758899 is 99885795418.

It is a cyclic number.

It is not a de Polignac number, because 81459758899 - 2¹³ = 81459750707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81459758839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5272624 + ... + 5288050.

It is an arithmetic number, because the mean of its divisors is an integer number (5268600288).

Almost surely, 2^81459758899 is an apocalyptic number.

81459758899 is a deficient number, since it is larger than the sum of its proper divisors (2837845709).

81459758899 is a wasteful number, since it uses less digits than its factorization.

81459758899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17034.

The product of its digits is 261273600, while the sum is 73.

The spelling of 81459758899 in words is "eighty-one billion, four hundred fifty-nine million, seven hundred fifty-eight thousand, eight hundred ninety-nine".